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misc: tegra_cec: add recover IOCTL

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Provide error recovery from IOCTL to user space.

Bug 1866338

Change-Id: I705ada6c8d4cb13f1c882993468f467da2908fdf
Signed-off-by: Chun XU <chunx@nvidia.com>
Reviewed-on: http://git-master/r/1300499
(cherry picked from commit a646f4903c8794641432fa838a27ee5584944eb5)
This commit is contained in:
Chun XU
2017-02-07 19:19:12 +08:00
committed by Jon Hunter
parent 5bf170a0c1
commit 5eb6b0d864
2 changed files with 33 additions and 1 deletions
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27
drivers/misc/tegra-cec/tegra_cec.c
View File

@@ -304,12 +304,38 @@ out:
return IRQ_HANDLED;
}
static long tegra_cec_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct tegra_cec *cec = file->private_data;
if (_IOC_TYPE(cmd) != TEGRA_CEC_IOC_MAGIC)
return -EINVAL;
switch (cmd) {
case TEGRA_CEC_IOCTL_ERROR_RECOVERY:
mutex_lock(&cec->recovery_lock);
tegra_cec_error_recovery(cec);
mutex_unlock(&cec->recovery_lock);
break;
default:
dev_err(cec->dev, "unsupported ioctl\n");
return -EINVAL;
}
return 0;
}
static const struct file_operations tegra_cec_fops = {
.owner = THIS_MODULE,
.open = tegra_cec_open,
.release = tegra_cec_release,
.read = tegra_cec_read,
.write = tegra_cec_write,
.unlocked_ioctl = tegra_cec_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = tegra_cec_ioctl,
#endif
};
static int tegra_cec_send_one_touch_play(struct tegra_cec *cec)
@@ -534,6 +560,7 @@ static int tegra_cec_probe(struct platform_device *pdev)
atomic_set(&cec->init_done, 0);
mutex_init(&cec->tx_lock);
mutex_init(&cec->recovery_lock);
#if defined(CONFIG_TEGRA_NVDISPLAY) && defined(CONFIG_TEGRA_POWERGATE)
ret = tegra_nvdisp_unpowergate_partition(cec->soc->powergate_id);

7
drivers/misc/tegra-cec/tegra_cec.h
View File

@@ -1,7 +1,7 @@
/*
* drivers/misc/tegra-cec/tegra_cec.h
*
* Copyright (c) 2012-2015, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2012-2017, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@@ -31,6 +31,7 @@ struct tegra_cec {
struct miscdevice misc_dev;
struct clk *clk;
struct mutex tx_lock;
struct mutex recovery_lock;
void __iomem *cec_base;
int tegra_cec_irq;
wait_queue_head_t rx_waitq;
@@ -163,4 +164,8 @@ static int tegra_cec_remove(struct platform_device *pdev);
#define TEGRA_CEC_NAME "tegra_cec"
#define TEGRA_CEC_IOC_MAGIC 'C'
#define TEGRA_CEC_IOCTL_ERROR_RECOVERY _IO(TEGRA_CEC_IOC_MAGIC, 1)
#endif /* TEGRA_CEC_H */